The Square Root Of -15 Has Been Described As Useless

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The square root of negative fifteen has been described as useless, namely by the mathematician who discovered it. But this number, and other imaginary numbers, aren't totally useless, they're just misunderstood. When this square root was discovered, mathematicians just didn't understand the potential for imaginary numbers. Learn the whole story, and why they aren't useless, in the video below.

The Useless Number

It only seemed useless because it was misunderstood.

An Introduction To Imaginary Numbers

In case you need to freshen up.

What Is a Friedman Number?

25 is one of them.

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